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From $26.00
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
From $0.25
'({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.
From $18.00
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
From $18.75
'({T}: Add {R}, {W}, or {B}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)
From $1.00
'({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.
From $53.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
From $10.25
'This land enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.
$0.25
'Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.
From $1.00
'This land enters tapped unless you control a Swamp. {T}: Add {B}. {B}, {T}: Target creature you control connives X, where X is the number of creatures that died this...
From $2.00
'({T}: Add {B}.) This land enters tapped unless you control three or more other Swamps. When this land enters untapped, you may put target creature card from your graveyard on...
From $27.25
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
From $13.50
'Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.) Whenever you tap a Swamp for...